Study On Packaging Of Tunable DFB Laser Module Based On Reconstruction Equivalent Chirp Technique

With the rapid development of mobile communication and fixed broadband access and the business of cloud computing, Internet and big data centers, the ability of the next generation wavelength division multiplexing (WDM) transmission system and optical network center of data transmission rate and the ability to process information almost growth exponentially, the demand for bandwidth up to an unprecedented height for the information society. The demand of low cost WDM technology is great. Dense wavelength division multiplexing (DWDM) technique is an effective way to improve the bandwidth and realize the high speed transmission, and the optical source which realizes the conversion between optics and electronics in DWDM becomes a key device. The optical module trends to be high integration, small volume, low power consumption and cost, high transmission rate, less crosstalk between channels, large transmission capacity and long distance transmission. Series tunable laser module has the advantages of wavelength tuning flexibility, stable performance, low consumption and production cost, can well realize the optical access network data transmission and meet the requirements of optical transmission capacity.This thesis mainly study on the packaging of tunable laser module based on reconstruction equivalent chirp technique, successfully realize eight channel series tunable semiconductor laser of 1550nm optical emitting module. Including design the package structure, analyze optical coupling theory, research module assembly and test. According to the principle and properties of semiconductor laser chip, designed the packaging structure with TEC, lens, isolator, collimator and output to a single mode fiber. Besides, design the drive circuit and temperature control circuit module to collect and feedback current and temperature information. By selecting certain channel and adjusting temperature, it covers 25.6nm continuous tuning range between 1535nm-1560nm band, and achieve 60 wavelengths output accommodates with ITU-T standard. The controlling mechanism is optimized by experiments and realized by special designed electronic circuits. The results show that the side mode suppression ratio (SMSR) of the tunable laser module up to 40 dB, output power is above-12dBm, and the optical power can achieve 1mW. In the transmission performance, tunable optical module width below 10 MHz and it can obtain a good eye diagram at 10 GHz signal after 10km transmission. So the optical module based on reconstruction equivalent chirp technology has a better application prospect in the dense wavelength division multiplex passive optical network (WDM-PON) system and the next generation optical network.This paper focuses on the packaging of eight channel tunable optical module based on reconstruction equivalent chirp technique. At first part, introduces the development of optical communication history, WDM-PON technology, expounds the classification and development of the semiconductor laser module, and then at the second part discuss the packaging technology of optical module, at the third part, explanation the principle of REC technology and the production process of DFB laser array, then at the forth part talk about the design and packing of tunable optical module. The result shows that it has a great value in communication system and has potential to realize industrialization. The main part of this paper is as follow:Emphatically research on the module design and theoretical model and manufacture work. According to the photo-electric characteristics of the laser, study on the temperature effect and building the temperature-current compensation relationship to tune the wavelength.In the process of packaging the laser array module, explore and set up multi-channel test platform, design the drive circuit and temperature control module to feedback current and temperature information, by optimizing process parameters, improve the coupling efficiency of optical module, stable packaging process to improve yield ratio. This paper realize eight channel tunable laser accommodated to ITU-T standard communication wavelength output, on the basis of traditional single chip packages to solve laser array module package problems, realize the wavelength tunable optical transfer module packaging, the result shows a stable performance with low cost, which has a great significance in experimental and practical application.